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Note 10 - Net Loss Per Share
6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Earnings Per Share [Text Block]
(
10
)  Net Loss per Share
 
Basic net loss per share is computed by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common share equivalents outstanding for the period determined using the treasury-stock method. For all periods presented, there is
no
difference in the number of shares used to calculate basic and diluted shares outstanding since the effects of potentially dilutive securities are antidilutive due to its net loss position.  
 
The following outstanding common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been antidilutive:
 
   
June 30,
 
   
2019
   
2018
 
Stock options to purchase common stock
   
618,366
     
630,911
 
Unvested restricted stock units
   
27,426
     
4,543
 
Common stock warrants
   
296,296
     
-
 
Total
   
942,088
     
635,454